Bedrock geologic map of the Grafton quadrangle, Worcester County, Massachusetts
Scientific Investigations Map
3171
Prepared in cooperation with the Commonwealth of Massachusetts, Massachusetts Geological Survey, Brigham Young University
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Abstract
The bedrock geology of the 7.5-minute Grafton, Massachusetts, quadrangle consists of deformed Neoproterozoic to early Paleozoic crystalline metamorphic and intrusive igneous rocks. Neoproterozoic intrusive, metasedimentary, and metavolcanic rocks crop out in the Avalon zone, and Cambrian to Silurian intrusive, metasedimentary, and metavolcanic rocks crop out in the Nashoba zone. Rocks of the Avalon and Nashoba zones, or terranes, are separated by the Bloody Bluff fault. The bedrock geology was mapped to study the tectonic history of the area and to provide a framework for ongoing hydrogeologic characterization of the fractured bedrock of Massachusetts.
This report presents mapping by G.J. Walsh, geochronology by J.N. Aleinikoff, geochemistry by M.J. Dorais, and consists of a map, text pamphlet, and GIS database. The map and text pamphlet are available in paper format or as downloadable files (see frame at right). The GIS database is available for download. The database includes contacts of bedrock geologic units, faults, outcrops, structural geologic information, and photographs.
Suggested Citation
Walsh, G.J., Aleinikoff, J.N., and Dorais, M.J., 2011, Bedrock geologic map of the Grafton quadrangle, Worcester County, Massachusetts: U.S. Geological Survey Scientific Investigations Map 3171, Pamphlet: iv, 39 p.; 1 Plate: 46.08 x 32.24 inches; Downloads Directory, https://doi.org/10.3133/sim3171.
ISSN: 2329-132X (online)
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Bedrock geologic map of the Grafton quadrangle, Worcester County, Massachusetts |
| Series title | Scientific Investigations Map |
| Series number | 3171 |
| DOI | 10.3133/sim3171 |
| Year Published | 2011 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Contributing office(s) | U.S. Geological Survey |
| Description | Pamphlet: iv, 39 p.; 1 Plate: 46.08 x 32.24 inches; Downloads Directory |
| Country | United States |
| State | Massachusetts |
| County | Worcester County |
| Other Geospatial | Grafton quadrangle |
| Datum | North American Datum 1927 |
| Projection | Polyconic projection |
| Scale | 24000 |